Multiple issue and pull request templates.

.github/ISSUE_TEMPLATE/features.md

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+<!--
+DO NOT FILE ISSUES FOR GENERAL SUPPORT QUESTIONS.
+
+The issue tracker is for reporting bugs and feature requests only.
+For end-user related support questions, refer to one of the following:
+
+- Stack Overflow (using the "traefik" tag): https://stackoverflow.com/questions/tagged/traefik
+- the Traefik community Slack channel: https://traefik.herokuapp.com
+
+-->
+
+
+### Do you want to request a *feature* or report a *bug*?
+
+Feature
+
+### What did you expect to see?
+
+<!--
+
+HOW TO WRITE A GOOD ISSUE?
+
+- Respect the issue template as much as possible.
+- If it's possible use the command `traefik bug`. See https://www.youtube.com/watch?v=Lyz62L8m93I.
+- The title must be short and descriptive.
+- Explain the conditions which led you to write this issue: the context.
+- The context should lead to something, an idea or a problem that you’re facing.
+- Remain clear and concise.
+- Format your messages to help the reader focus on what matters and understand the structure of your message, use Markdown syntax https://help.github.com/articles/github-flavored-markdown
+
+-->
+